Charles-Francois Lebrun (1739-1824) Duke of Plaisance in the Costume of the Archtreasurer of the Empire Francois Pascal Simon Gerard (1770-1837)

The picture has something of this: people, portrait, wear, opera, veil, cape, music, royalty, man, theater, leader, queen, jewelry.
Perhaps it’s a painting of a man in a black and white outfit with a red sash around his neck and a white and gold trim around his neckline.